1#ifndef _ASM_POWERPC_KPROBES_H
2#define _ASM_POWERPC_KPROBES_H
3#ifdef __KERNEL__
4/*
5 *  Kernel Probes (KProbes)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 *
21 * Copyright (C) IBM Corporation, 2002, 2004
22 *
23 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
24 *		Probes initial implementation ( includes suggestions from
25 *		Rusty Russell).
26 * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
27 *		<ananth@in.ibm.com>
28 */
29#include <linux/types.h>
30#include <linux/ptrace.h>
31#include <linux/percpu.h>
32#include <asm/probes.h>
33#include <asm/code-patching.h>
34
35#define  __ARCH_WANT_KPROBES_INSN_SLOT
36
37struct pt_regs;
38struct kprobe;
39
40typedef ppc_opcode_t kprobe_opcode_t;
41#define MAX_INSN_SIZE 1
42
43#ifdef CONFIG_PPC64
44/*
45 * 64bit powerpc uses function descriptors.
46 * Handle cases where:
47 * 		- User passes a <.symbol> or <module:.symbol>
48 * 		- User passes a <symbol> or <module:symbol>
49 * 		- User passes a non-existent symbol, kallsyms_lookup_name
50 * 		  returns 0. Don't deref the NULL pointer in that case
51 */
52#define kprobe_lookup_name(name, addr)					\
53{									\
54	addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);		\
55	if (addr) {							\
56		char *colon;						\
57		if ((colon = strchr(name, ':')) != NULL) {		\
58			colon++;					\
59			if (*colon != '\0' && *colon != '.')		\
60				addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
61		} else if (name[0] != '.')				\
62			addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
63	} else {							\
64		char dot_name[KSYM_NAME_LEN];				\
65		dot_name[0] = '.';					\
66		dot_name[1] = '\0';					\
67		strncat(dot_name, name, KSYM_NAME_LEN - 2);		\
68		addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
69	}								\
70}
71#endif
72
73#define flush_insn_slot(p)	do { } while (0)
74#define kretprobe_blacklist_size 0
75
76void kretprobe_trampoline(void);
77extern void arch_remove_kprobe(struct kprobe *p);
78
79/* Architecture specific copy of original instruction */
80struct arch_specific_insn {
81	/* copy of original instruction */
82	kprobe_opcode_t *insn;
83	/*
84	 * Set in kprobes code, initially to 0. If the instruction can be
85	 * eumulated, this is set to 1, if not, to -1.
86	 */
87	int boostable;
88};
89
90struct prev_kprobe {
91	struct kprobe *kp;
92	unsigned long status;
93	unsigned long saved_msr;
94};
95
96/* per-cpu kprobe control block */
97struct kprobe_ctlblk {
98	unsigned long kprobe_status;
99	unsigned long kprobe_saved_msr;
100	struct pt_regs jprobe_saved_regs;
101	struct prev_kprobe prev_kprobe;
102};
103
104extern int kprobe_exceptions_notify(struct notifier_block *self,
105					unsigned long val, void *data);
106extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
107#endif /* __KERNEL__ */
108#endif	/* _ASM_POWERPC_KPROBES_H */
109